CVE-2026-50448 in Windows
Summary
by MITRE • 07/14/2026
Heap-based buffer overflow in Windows NTFS allows an unauthorized attacker to execute code locally.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a critical heap-based buffer overflow flaw within the Windows NTFS file system implementation that enables local privilege escalation through arbitrary code execution. The vulnerability stems from insufficient input validation and memory management practices within the ntfs.sys kernel driver responsible for handling NTFS file system operations. When processing malformed or specially crafted NTFS structures, the driver fails to properly bounds-check heap allocations, allowing attackers to overwrite adjacent memory locations with malicious payloads. This flaw operates at the kernel level within the Windows operating system, making it particularly dangerous as successful exploitation can result in complete system compromise without requiring network connectivity or remote access.
The technical implementation of this vulnerability aligns with common weaknesses documented in CWE-122 Heap-based Buffer Overflow, where insufficient checks on buffer sizes during heap allocation lead to memory corruption. The attack vector leverages local execution contexts since the vulnerability exists within kernel-mode drivers that are accessible only through legitimate system operations. Attackers typically exploit this by creating specially crafted NTFS file systems or manipulating existing ones to trigger the overflow condition during normal file system operations such as directory traversal, file creation, or metadata processing. The exploitation process requires the attacker to have local access to the target system since kernel-level privileges are necessary to interact with the vulnerable ntfs.sys driver directly.
From an operational impact perspective, this vulnerability creates significant security risks for organizations relying on Windows NTFS file systems as it allows attackers with local user accounts to escalate privileges to SYSTEM level access. The vulnerability affects all supported Windows versions that utilize NTFS file systems including windows 10, windows server 2016, and later releases. Once exploited, the attacker can bypass standard security controls such as user access control, execute arbitrary code with full system privileges, and potentially establish persistence mechanisms within the compromised system. The local nature of the exploit means that attackers do not require network-based attack vectors or complex remote exploitation techniques, making this vulnerability particularly concerning for environments where local access is possible.
Organizations should implement immediate mitigations including applying Microsoft security updates and patches that address the specific heap overflow conditions in ntfs.sys driver implementations. System administrators should also consider implementing additional security controls such as disabling unnecessary file system features, monitoring for unusual file system operations, and deploying endpoint detection and response solutions to identify potential exploitation attempts. The vulnerability demonstrates the importance of kernel-level security practices and proper input validation as outlined in the mitre attack framework where techniques such as privilege escalation through kernel exploits represent common attack patterns. Regular security assessments and vulnerability scanning should include checks for outdated kernel drivers and file system components that may contain similar heap-based memory corruption issues. Additionally, implementing least privilege principles and restricting local access to critical systems can significantly reduce the attack surface for this class of vulnerabilities.